making gt40 heads flow

Steven · Nov 7, 2009

A) home made port job, big nono, B) call thumper C) again keep your die grinder to yourself lol

Mustangmaster77 · Nov 8, 2009

Not trying to thread jack, but would the clearance be ok with a TFS stage 1 or should I check it anyways?

Steven · Nov 8, 2009

It'll be fine. Its really designed for stock pistons. Kind of like the E cam and B cam

Mustangmaster77 · Nov 8, 2009

Awesome!, thanks.

blackpony · Nov 10, 2009

The stage II cam is NOT too big for your application. I know a guy with a 306, old skool windsor heads (basically the same as gt-40) he put the stage II in it and it made 275 to the wheels!!! IMO the stage II is a perfect cam for a set of ported gt-40's or aluminum headed 302/306.... un ported gt-40's probably better stick with the stage I..... My 2 cents

LAFENATU · Nov 11, 2009

That 306 that has the TFS 2 cam probably has provisions for larger cams unlike a stock small block 302.

GREG@SN95 · Nov 11, 2009

Steven said:
A) home made port job, big nono, B) call thumper C) again keep your die grinder to yourself lol

Why is porting your own heads a big nono? Port work really isn't hard at all and pretty much anyone with the tools, common sense and knowledge can do it. I know several people that do their own port work... including a guy that 20 years ago tried and now has a very successful machine shop...

Crone · Nov 11, 2009

I have only done one set of heads, but I used to port intake manifolds for people all the time. I used to make pretty decent money out of it. Back before I worked full time lol.... I never had a complaint about any of my work either. I think if you read up and research about the peice your gonna be porting you won't have a problem, just practice on some junk first then do your peice and you should be fine. It's not going to be as great as a machine shop obviously but it was pretty much free!

LAFENATU · Nov 11, 2009

rebelyell said:
Why is porting your own heads a big nono? Port work really isn't hard at all and pretty much anyone with the tools, common sense and knowledge can do it.

Oh wow...that is one of the craziest statement I have ever heard.

I would never port my own heads.

You could end up having strong holds and weak holds. You could hit to deeply and grind through into a coolant passage and your heads are done. You have to know how a head works to make it better. Enlarging a port is just a small part of the work. You have to know how to increase velocity not increase the amount of air flow. There are at least 15 different measurements into consideration just to guaruntee similarities and have the heads flow evenly.

I wouldn't even touch a set of heads. That is why I have pro's port heads.

brad94GT · Nov 11, 2009

its not even hard to port heads

LAFENATU · Nov 11, 2009

brad94GT said:
its not even hard to port heads

wut?

Did you completely miss what I just said?

Javi · Nov 12, 2009

Porting heads aint as easy as every makes it sound.

mustangshane · Nov 12, 2009

I've never had a problem porting my own heads. I have a set I'm going to port for my car. Got'em for free. It's not the easiest thing. Do I wish I had a CNC machine and the intake and exhaust ports drawn up so I could maximize the flow and velocity. Yes. But for what I'm running the time and expense for doing it myself is negligible. Plus its a great skill to develop. If you have a spare set I encourage anyone to try it. There is nothing like running your own ported heads. To those who dont want to or feel they cant do a proper job. Thats fine too! But dont say that someone who ports their own heads cant do a proper job. Because that's just reckless.

LAFENATU · Nov 12, 2009

I never said don't port your heads in general/at all. What I mean is if you have never done it..don't jump into a decent set of heads...don't take a dremel and go at it.

If your gonna do it...know what your doing.

ie: practice on some sh1tty heads. Ruining a decent/nice set of heads would be awful. No one wants that.

I see a lot of people try and port their heads and fvck them up.

mustangshane · Nov 12, 2009

LAFENATU said:
I never said don't port your heads in general/at all. What I mean is if you have never done it..don't jump into a decent set of heads...don't take a dremel and go at it.

If your gonna do it...know what your doing.

ie: practice on some sh1tty heads. Ruining a decent/nice set of heads would be awful. No one wants that.

I see a lot of people try and port their heads and fvck them up.

I agree with you. Thats why I said a "spare set" to try it on. The first set of heads I did were supervised by a friend of mine that built engines for some guys in the NHRA. We did a sweet job on those heads. He really helped me a lot. But not everyone has that. So take it slow and dont do it to a set of new heads. Get some old E7's and ask a lot of questions.

blackpony · Nov 12, 2009

LAFENATU said:
That 306 that has the TFS 2 cam probably has provisions for larger cams unlike a stock small block 302.

no actually it doesn't, he has a set of factory style .030 pistons... yes they have valve reliefs, but they are no different then the factory ones... the biggest problem with ptv is getting a big lift cam with a lot of duration.... the tftw 2 cam only has 224 and 232 duration at .50... that is nothing....